M.W.
My girls play video games (ages 3 and 8), but certainly not anything like Halo! There are some fun games for children on the Wii & they're not games you just sit on the couch & play. They get up & jump around. We also have an Xbox & they have Nintendo DSs; both have fun, educational games, especially the DS system.
I do believe that video games can be fun, educational & family oriented. I wouldn't, however, feel any pressure to allow them to play simply because their friends are; nor would I allow any games that aren't appropriate.